Sincro DG83-D - Page 9

- 9 -
CZ sincro
DG83 D
NOTE
• Measurement of the ignition coil charging time allows to identify the
cause of various faults.
• A charging time below 3 milliseconds can cause a poor ignition energy
with high resistance spark cables and a decrease in engine power,
misfires during acceleration, possible damages to carburettors of LPG
fuel systems and to catalysts due to fire return, increase in fuel
consumption and gas emissions.
• Reduced charging time can be due to a faulty inductive sensor or Hall
sensor, not suitable ignition coil or faulty module. If time is within the
limits, check the resistance of connection to ground of the module.
• Other faults can be due to connection cables that go from the sensor
to the power module, connections to the module with too much resis-
tance due to contacts’ oxidation, etc.
• In distributor systems a reduced energy can be caused by a poor Dwell
or faulty contacts. An early burning of contacts can be caused by a too
high Dwell or faults in the damping capacitor mounted between contacts
and ground.
Possible differences of Dwell between cams have to be checked by
connecting the inductive clamp to the spark plug cable of each cylinder.
Differences should remain within 3 degrees.
• An excessive advance variation, when reconnecting the vacuum tube,
could be caused by the wear of the baseplate pivot.
Fig. 9
AD17:
-FORD
-BOSCH
AD23:
-FIAT
-LANCIA
AD18 :
-OPEL
-PEUGEOT
EXAMPLES OF ADAPTERS FOR DWELL TESTS (optional)
(–) Prim. A
(–) Prim. B
(–) Prim. A
(–) Prim.
B
+15
(–) Prim. C
+ 15
(–) Prim. A
(–) Prim. B
1
2
1
2
3
1
2
3
4
ALFA ROMEO Super 164 V6
OPEL Calibra V6 Kat and others
FIAT Punto and others
A
B
+15(–) Prim. A (–) Prim. B +15
+15
Sec.1
Cyl.
1
4
2
3
Sec.1
Cyl.
1
2
5
6
3
4
+15
(–) Prim. A
(–) Prim. B
(–) Prim. A
(–) Prim. B
(–) Prim. C
FIAT - LANCIA
DIS Coils - Marelli
Sec.2
Sec.2
Sec.3